Частина 1 — Вправи: 1065

1065. Розв'яжи рівняння:

а) –3х + 7 = –2;

–3х = –9;

х = (–9) : (–3);

х = 3.

б) 2х – 14 = –6;

2х = 8;

х = 8 : 2;

х = 4.

в) –3х – 6х = –18;

–9х = –18;

х = (–18) : (–9);

х = 2.

г) 2х + 6х = –48;

8х = –48;

х = –48 : 8;

х = –6.

ґ) 68 – (–7х – 12) = 108;

68 + 7х + 12 = 108;

7х = 108 – 80;

7х = 28;

х = 4.

д) –(3 – 5х) – 2х + 28 = –5;

–3 + 5х – 2х + 28 = –5;

3х + 25 = –5;

3х = –30;

х = –30 : 3;

х = –10.